docs: def cvpool(agent):
      """
      Indicate whether or not any watched kernel variables that have a
      specified agent on their notification list have been updated.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/cvpool_c.html
  
      :param agent: Name of the agent to check for notices.
      :type agent: str
      :return: True if variables for "agent" have been updated.
      :rtype: bool
      """
      agent = stypes.stringToCharP(agent)
      update = ctypes.c_int()
      libspice.cvpool_c(agent, ctypes.byref(update))
      return bool(update.value)